Sans Costume
Bring Undertale's favorite laid-back skeleton to life with this easy cosplay.
Sans from the hit indie game Undertale is a beloved, easy-going skeleton known for his puns, love of ketchup, and surprisingly tough boss fight. Dressing up as Sans is incredibly popular because of how comfortable and recognizable his casual outfit is. The look consists of a classic blue hoodie, black athletic shorts with white stripes, pink slippers, and a skeleton mask or face paint.
- Difficulty
- Easy
- Time
- ~30 min
- Budget
- $30–80
Try it on
See yourself as Sans
One clear photo of yourself; we render you in this costume — face untouched, full body, about 20 seconds.
One render, $1. No account needed — if it fails you're not charged. Pricing.
Your photo is sent to Google's Gemini API to make the render and isn't used for training. Renders are AI-generated and labelled.
Want a different costume on this photo, or a whole group in costume? Open the Try-On Studio.
What you need for a Sans costume
Short on time? Buy it ready-made
Spirit Halloween sells the complete Sans costume — one box instead of 6 pieces.
Blue zip-up hoodie
A classic bright blue or royal blue zip-up hooded sweatshirt, preferably with a white lining or white faux-fur trim on the hood.
White t-shirt
A plain white crewneck t-shirt worn underneath the unzipped blue hoodie.
Black athletic shorts
Black basketball or gym shorts featuring a vertical white stripe down each side.
DIY: Use white fabric paint or white duct tape to add vertical stripes to plain black shorts.
Skeleton mask or face paint
A full-head latex skeleton mask with large black eye sockets, or white and black face paint to draw a skull.
DIY: Paint your face white, circle your eyes in black, and draw black vertical teeth lines over your lips.
Pink slip-on slippers
Plush, bright pink house slippers or slide-on sandals.
Black leggings or tights
Opaque black leggings or tights worn under the shorts to represent Sans's black skeleton legs.
Rather not assemble it? See ready-made Sans costumes at Spirit Halloween ↗
How to put it together
- 1
Put on the black opaque leggings or tights to serve as your skeletal legs.
- 2
Layer the black athletic shorts with white side stripes over the leggings.
- 3
Put on the plain white crewneck t-shirt.
- 4
Layer the bright blue zip-up hoodie over the t-shirt, leaving it fully unzipped.
- 5
Put on the skeleton mask, or apply your black-and-white skull face paint.
- 6
Slip into the bright pink plush house slippers.
- 7
Keep your hands casually tucked into your hoodie pockets to capture Sans's relaxed posture.
Makeup & hair
If you are not using a mask, paint your entire face white. Use black face paint to create large, rounded circles around your eyes, a small upside-down heart on your nose, and a wide, permanent grin with vertical black lines for teeth. For an optional boss-battle effect, color one of your pupils bright blue or use a blue LED eye accessory.
Sans for couples, groups, kids & more
- couples
- Pair up with someone dressed as his tall, energetic brother Papyrus in a red scarf and battle body armor.
- group
- Form an Undertale group with Frisk in a blue-and-purple striped shirt, Toriel, and Papyrus.
- kids
- Kids can easily wear a scaled-down blue hoodie, black sweatpants, and comfortable pink slip-ons.
- Plus size
- This loose-fitting athletic wear costume is naturally comfortable and highly adjustable for all body types.
Tips
- Keep your hands in your pockets as much as possible to stay in character and mimic his in-game sprite.
- For outdoor events, the layers of leggings and a hoodie make this an exceptionally warm and comfortable choice.
- Carry a bottle of tomato ketchup as a simple, character-accurate prop.
- If using face paint, apply a setting spray so the white makeup doesn't rub off onto your blue hoodie.
Sans costume FAQ
- What color are Sans's slippers?
- While his in-game sprite is black and white, official merchandise and fan consensus widely depict Sans wearing bright pink house slippers.
- How do you do the glowing blue eye effect?
- You can use a safe, costume-grade blue LED light-up eyepatch under your mask, or paint a bright neon blue circle in your left eye socket using UV-reactive face paint.
- Is Sans's hoodie zipped or unzipped?
- Sans wears his blue hoodie completely unzipped, revealing a plain white shirt underneath.
Did you know? Sans is named after the Comic Sans font, which is the typeface used for all of his dialogue boxes in the game Undertale.